The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 12, 2009
Filed:
Jul. 16, 2007
Applicants:
Kosuke Yanagidaira, Kawasaki, JP;
Koichi Fukuda, Yokohama, JP;
Takahiko Hara, Yokohama, JP;
Inventors:
Assignee:
Kabushiki Kaisha Toshiba, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11C 11/34 (2006.01);
U.S. Cl.
CPC ...
Abstract
A semiconductor memory device includes a memory cell array, a voltage generating circuit, a memory circuit which stores a reference pulse number of an erase voltage of the memory cell array and a parameter, and a control circuit which controls, when a pulse number of the erase voltage exceeds the reference pulse number of the erase voltage, the voltage generating circuit in a manner to increase at least an erase verify level in accordance with the parameter.